I think the database was started with the controlfiles present
Thats why it's running fine now.
I can connect with rman, thats no problem.

I only thougt, that now the caontrolfiles are not in place anymore, the database would show some errors or something. But it seems the db doesn't care the controlfiles are not there anymore.
Only when stopping and starting it again I guess
But once running, the controlfile is in memory ?